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The effects of a delay variation in a linearisation loop on the linearisation performance of the loop is studied, especially when the loop uses a one-pilot control method. A delay variation in a linearisation loop caused by ageing and environmental changes is inevitable and unadjustable. Therefore, a two-pilot control method and a control algorithm having stable and fast convergence characteristics are proposed to minimise the deterioration of the linearisation performance due to a delay variation. The experimental results of the proposed control method and algorithm are presented. The ability to reduce the performance degradation caused by a delay variation in the linearisation loop is also demonstrated.